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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/108461] New: '-fcompare-debug' failure
 (length) w/ -mcpu=e500mc -O2 -ftrapv -fno-expensive-optimizations
 -fno-guess-branch-probability -fno-tree-dce -fno-tree-dse
Date: Thu, 19 Jan 2023 07:49:41 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: compare-debug-failure
X-Bugzilla-Severity: normal
X-Bugzilla-Who: asolokha at gmx dot com
X-Bugzilla-Status: UNCONFIRMED
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108461

            Bug ID: 108461
           Summary: '-fcompare-debug' failure (length) w/ -mcpu=3De500mc -O2
                    -ftrapv -fno-expensive-optimizations
                    -fno-guess-branch-probability -fno-tree-dce
                    -fno-tree-dse
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: compare-debug-failure
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: powerpc-e300c3-linux-gnu

Created attachment 54303
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54303&action=3Dedit
gkd diff w/ -m32

gcc 13.0.0 20230115 snapshot (g:05cd79c2420d3fe6d84bad694d9808982112b0f0) f=
ails
-fcompare-debug check when compiling the following testcase w/ -mcpu=3De500=
mc -O2
-fcompare-debug -ftrapv -fno-expensive-optimizations
-fno-guess-branch-probability -fno-tree-dce -fno-tree-dse:

char m;

void
bar (int y)
{
  int a =3D 1;

  a =3D 0x3e10 < y + a + 0x3e00;
}

void
foo (char x)
{
  for (x =3D 0; x < 3; ++x)
    {
      if (m)
        bar (m);

      m =3D x;
    }
}

% powerpc-e300c3-linux-gnu-gcc-13 -m32 -mcpu=3De500mc -O2 -fcompare-debug -=
ftrapv
-fno-expensive-optimizations -fno-guess-branch-probability -fno-tree-dce
-fno-tree-dse -c oxbijmxo.c
powerpc-e300c3-linux-gnu-gcc-13: error: oxbijmxo.c: '-fcompare-debug' failu=
re
(length)

gkd diff attached.=